Rydberg atoms play a pivotal role in the fields of quantum simulation, quantum computing, and quantum sensing, in which the frequency locking and detuning of the laser used to excite the atoms to Rydberg states are crucial. Here, we introduce a novel frequency locking approach for Rydberg lasers at arbitrary frequencies using the Zeeman effect of both DC and AC magnetic fields. The DC magnetic field is used to shift the atomic energy levels, thus altering the frequency locking point, while the AC magnetic field is employed for Zeeman modulation to generate the error signal. This method also enables free tuning of the laser frequency within a sub-hundred MHz range by adjusting the DC magnetic field while maintaining frequency locking.
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